Adjustable razor-blade guard



H. S. HASSELQUIST.

ADJUSTABLE RAZOR BLADE GUARD.

APPLICATION FILED NOV-24 I919.

Patented Mar. 23,1920.

UNITED STATES PATENT OFFICE.

HUGO S. HASSELQUIST, OF OAK PARK, ILLINOIS, ASSIGNOIR- TO COLLINS ROTARYSAFETY RAZOR COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF SOUTHDAKOTA.

ADJUSTABLE RAZOR-BLADE GUARD.

Specification of Letters Patent. Patented M 2 3, 192() Application filedNovember 24, 1919. Serial No. 340,155.

' Razor-Blade Guards, of-which the following is a specification.

My present invention relates to guards or shields for razor-blades andconcerns more particularly, but not exclusively, adjustable mountingsfor the guards of rotary razorblades. The leading purpose of theinvention is the provision of an appliance of this type of simplestructure unlikely to become deranged or damaged in service and whichpermits adjustment of the guard or shield without touching the latter,hence avoiding the danger of cutting the fingers on the adj acent sharpedge of the blade. To the accomplishment of this end, special means areprovided for obtaining such adjustment, whereby danger of unintentionalvariation or change of the adjustment is obviated.

In order to illustrate how the accomplishment of this main object andvarious other purposes is obtained in a simple embodiment of theinvention, I have illustrated in the accompanying drawing forming a partof this specification, a preferred incorporation of the invention inphysical form, and in the two views thereof the same referencecharacters refer to corresponding parts.

In this drawing:

Figure 1 is an enlarged fragmentary vertical section through the rotaryrazor and its adjustable guard, and

Fig. 2 is a plan view of the spring associated with such guard. in

Referring to the drawing it will be perceived that the applianceincludes a stationary, hollow, cylindrical-post 10, externallyscrew-threaded at 11, provided with a lengthwise groove or key-way 12,and equipped with an outstanding circular rib 13, affording a shoulder14. The handle for the razor comprises in part a sheet-metal shell orcasing element 15 having an inturned flange or circular lip 16 adaptedto bear against the shoulder 14 on which it is pressed and firmly heldby a retaining-nut 17 screwed on the threaded post.

Internally such hollow post accommodates a hollow rotary drive-shaft 18revolved by a mechanical-motor (not shown) contained or housed in thehandle of which the element 15 forms a part. At its top or outer endshaft 18 carries and rotates a circular disk sharp-edged blade 19 abovewhich is a face-plate 20 supported on an inner stationary or fixed post(not illustrated).

A round, toothed or notched blade-guard 21 of the shape in cross-sectionclearly shown is soldered or otherwise firmly fixed to a flanged ringsupport 22 mounted and slidable longitudinally on the post 10 over itsscrew-thread, turning of such support and its blade-guard beingprevented by a projection or key 23 thereon fitted and slidable in thekeyway or groove of the post.

'A threaded retaining collar 24 is screwed on the end of the post andpositioned between it and the guard-support I employ a leaf-spring disk25 having pressed upwardly out of its plane a plurality, in the presentinstance three, of curved resilient leaves or strips 26. By this springconstruction the blade-guard and its supporting ring are yieldinglypressed downwardly or away from the circular disk razor-blade.

A portion of the element 22 is externally screw-threaded and on suchpart is an internally-threaded adjustment sleeve 27 bearing at one endon the face of the adjacent clamp nut 17 This sleeve has fixed to it asuitablyshaped knurled or roughened cover member 28 desirably of a widthto shield and cover the elements 27 and 17 and a portion of member 15,all as is clearly shown in the drawing. v

It will be perceived, therefore, that the support for the razor-guard isretained between the spring element 25 and the sleeve 27. Owin to theclearance spaces between the parts 1% and 22 and 27 and 21 turning ofthe sleeve 27 b its cover element 28 may be employed to e ect thedesired adjustment of the. guard toward and from the associatedrazor-blade, the support for the ard at all times being pressed down orinwardly by the spring 25 so far as is permitted by the engagement ofthe adjustment sleeve 27 with the clamping nut 17 Obviously, by theemployment of a construction of this character, there is no danger ofunintentionally deranging or modifying the adjustment of the guard bythe or amount of adjustment or position of the' guard being easily seenat all times, including those during which the adjustment is beingbrought about.

It is to be understood that the particular embodiment of the inventionillustrated and described is merely set forth by way of example only ofone practical appliance incorporating the features of construction andoperation of the invention. It will be understood, however, that theinvention is susceptible of various emb diments differing more or lessin mechanical details and hence, the invention is not limited andrestricted to the precise and 'exactmechanical elements and features ofstructure presented.

I claim:

1. In a razor-guard construction of the character described, thecombination of a support, a round razor-guard slidably but non-rotatablymounted on said support, and threaded means to adjust the position ofthe guard on saidsup'port, substantially as described.

2. In a razor-guard construction of the character descr'lced, thecombination of a support, a razor guard slidable on said support, aspring acting on said guard pressing it in one direction, and means toadjustably move the guard in the opposite direction against the actionof the spring, substantially as described.

In arazor-guard construction of the character described, the combinationof asupport, a round razor-guard slidably butnon-rgtatably mounted onsaid support, a spring acting on said guard pressing it in onedirection, and a threaded means adapted to adjustably move said guard inthe opor accidental modification of its position is practicallyimpossible,

posite direction against the action of said spring, substantially asdescribed.

4.111 a razor-guard construction of the character described, thecombination of a support, a round razor-guard slidably but non-rotatablymounted on said support, a spring acting on said guard pressing it inone direction, an adjustment sleeve having threaded engagement with saidguard adapted to adjustably move said guard in the opposite directionagainst the action of the spring, and an abutment against which saidsleeve bears,'substantially as described.

5. In a razor-guard construction ofthe character described, thecombination of a shouldered, threaded post with a longitudinal keyway, ahandle-casing having an inturned lip overlying the shoulder of saidpost, a threaded clamping-nut on said post holding said lip against saidshoulder, a flanged razor-guard, a'th-readed support for said guardhaving akey in said keyway and slidable on said post over its thread, aspring bearing against said support tending to slide it lengthwise ofsaid post, a collar on said post against which said spring bears, and asleeve threaded on said support and bearing on said nut and adapted tobe turned to vary the longitudinal a justment of said guard,

substantially as described.

6. In a razor-guard construction of the character described, thecombination of a shouldered threaded nal keyway, a handle-casing havingan inturned lip overlying the shoulder of said post, a threadedclamping-nut on said post holding said lip against said shoulder, aflanged razor-guard, an externally-threaded support for said guardhaving a'key in said keyway and slidable on the post over its thread, adisk-spring having a. plurality of strips bearing against said supporttending to slide it lengthwise of said post, a collar on said postagainst which said spring bears, and an internally-threaded sleevecooperating with the thread of said support and bearing on said nut andadapted to be turned to vary the longitudinal adjustment of said guard,substantially as described.

HUGO S. HASSELQUIST.

post with a longitudi-.

